Sir, the silverado that we have here, the rear brakes are Drum brakes not rotor disk brakes. Only the front are rotor disk brakes. The diagram that you sent to me is rotor disk brake. One more thing is that when I run the car, it would take almost 100 meters before the speedometer work and the transmission start to shift as well.I replaced the vehicle speed sensor but still the same problem.

Disk or drum they should be similar in location. However some only uses one sensor and that is on the differential. I do not know if yours is equipped with this. Our database des not have much on the location of the sensors. Even the diagnostic is rather vague.

This silverado model is C1500. VIN 1GCEK14J57Z576861. Because I cant find the rear wheel speed sensor, I opt to replace the vehicle speed sensor and scanned it again. But it displays the same DTC C0055.